Linux Reads Serial Data

最新推荐文章于 2024-12-21 12:29:19 发布

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最新推荐文章于 2024-12-21 12:29:19 发布

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分类专栏： linux 串口读取传感器文章标签： linux 串口读取传感器

本文链接：https://blog.youkuaiyun.com/d_Nail/article/details/89059699

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本文介绍了如何在Linux环境下读取串口数据，特别是从传感器获取数据的情况。内容包括数据格式、串口初始化、数据读取与分析以及将数据存储到MySQL数据库的操作流程。

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Linux Reads Serial Data

Computer serial port data reading is often used when using sensors. Next, I introduce the method of reading Linux serial port data in a project. I hope it will be helpful to you.

Data Format

A set of data transmitted by the sensor through serial port is 13 bytes. The data format is as follows:

在这里插入图片描述

Initialize Serial Port

We need to initialize the serial port before reading the serial port data. The initialization of the serial port needs three steps:opening the serial port, setting the parameters of the serial port (including baud rate, data bit, stop bit, check bit).

Opening the Port

The procedure of opening serial port is as follow, function returns a handle:

int openPort()
{
    int fd;
    fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY |O_NDELAY);   
    if(fd == -1)
  	{
        perror("open serial failed!\n");
        exit(1);
    }    
    return fd;
}

SERIAL_PORT is a serial address;
O_RDWR means to open in a readable and writable manner;
O_NOCTTY indicates that if the open file is a terminal device, the terminal will not be regarded as a process control terminal;
O_NDELAY denotes opening a file in an uninterruptible manner.

Setting the Parameters

Here is the program for setting baud rate and data bits

int setSpeed(int fd, int speed, struct termios Opt)
{
  int i;

  if(tcgetattr(STDIN_FILENO, &Opt) !

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